3v4l.org

run code in 300+ PHP versions simultaneously
<?php $res = preg_grep('#\d#u', ['a', "1\xFF", 'c']); var_dump(preg_last_error()); var_dump($res);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
int(4) array(0) { }
preferences:
145.96 ms | 1504 KiB | 4 Q